<template>

    <div class="header">
        <div class="inner-header flex">
            <h1>简单的 CSS 波浪效果</h1>
        </div>
        <p style="display: none;">这是使用 SVG 和 CSS 动画制作的波浪效果，上半部分是蓝色（可修改成其他颜色）渐变的背景颜色，下半部分就是波浪，有四条波浪在不停的来回起伏，非常逼真。该波浪效果可用于大部分页面的底部。</p>

        <div>
            <svg
                    class="waves"
                    xmlns="http://www.w3.org/2000/svg"
                    xmlns:xlink="http://www.w3.org/1999/xlink"
                    viewBox="0 24 150 28"
                    preserveAspectRatio="none"
                    shape-rendering="auto"
            >
                <defs>
                    <path
                            id="gentle-wave"
                            d="M-160 44c30 0 58-18 88-18s 58 18 88 18 58-18 88-18 58 18 88 18 v44h-352z"
                    />
                </defs>
                <g class="parallax">
                    <use xlink:href="#gentle-wave" x="48" y="0" fill="rgba(255,255,255,0.7" />
                    <use xlink:href="#gentle-wave" x="48" y="3" fill="rgba(255,255,255,0.5)" />
                    <use xlink:href="#gentle-wave" x="48" y="5" fill="rgba(255,255,255,0.3)" />
                    <use xlink:href="#gentle-wave" x="48" y="7" fill="#fff" />
                </g>
            </svg>
        </div>
    </div>


</template>

<script>
    export default {
        name : "my-header",
        data() {
            return{
                loading: true,
            }
        },
        methods : {
            logout(){
                sessionStorage.removeItem("user")
                sessionStorage.removeItem("token")
                this.$router.push('/')
            },
        },
        beforeMount(){
            //this.user = JSON.parse(window.sessionStorage.getItem("user"))
        },

    }

</script>

<style scoped src="@assets/static/css/vue-transition.css"></style>

<style scoped>
    h1 {
        font-family: 'Lato', sans-serif;
        font-weight: 300;
        letter-spacing: 2px;
        font-size: 48px;
    }
    p {
        font-family: 'Lato', sans-serif;
        letter-spacing: 1px;
        font-size: 14px;
        color: #333333;
    }

    .header {
        position: relative;
        text-align: center;
        background: linear-gradient(60deg, rgba(84, 58, 183, 1) 0%, rgba(0, 172, 193, 1) 100%);
        color: white;
    }
    .logo {
        width: 50px;
        fill: white;
        padding-right: 15px;
        display: inline-block;
        vertical-align: middle;
    }

    .inner-header {
        height: 65vh;
        width: 100%;
        margin: 0;
        padding: 0;
    }

    .flex {
        /*Flexbox for containers*/
        display: flex;
        justify-content: center;
        align-items: center;
        text-align: center;
    }

    .waves {
        position: relative;
        width: 100%;
        height: 15vh;
        margin-bottom: -7px; /*Fix for safari gap*/
        min-height: 100px;
        max-height: 150px;
    }

    .content {
        position: relative;
        height: 20vh;
        text-align: center;
        background-color: white;
    }

    .content a {
        margin: 0 5px;
        font-size: 12px;
        color: #333;
    }

    .content a:hover {
        color: #000;
    }

    /* Animation */

    .parallax > use {
        animation: move-forever 25s cubic-bezier(0.55, 0.5, 0.45, 0.5) infinite;
    }
    .parallax > use:nth-child(1) {
        animation-delay: -2s;
        animation-duration: 7s;
    }
    .parallax > use:nth-child(2) {
        animation-delay: -3s;
        animation-duration: 10s;
    }
    .parallax > use:nth-child(3) {
        animation-delay: -4s;
        animation-duration: 13s;
    }
    .parallax > use:nth-child(4) {
        animation-delay: -5s;
        animation-duration: 20s;
    }
    @keyframes move-forever {
        0% {
            transform: translate3d(-90px, 0, 0);
        }
        100% {
            transform: translate3d(85px, 0, 0);
        }
    }
    /*Shrinking for mobile*/
    @media (max-width: 768px) {
        .waves {
            height: 40px;
            min-height: 40px;
        }
        .content {
            height: 30vh;
        }
        h1 {
            font-size: 24px;
        }
    }
</style>
